全文获取类型
收费全文 | 22479篇 |
免费 | 619篇 |
国内免费 | 3篇 |
专业分类
管理学 | 3069篇 |
民族学 | 113篇 |
人才学 | 3篇 |
人口学 | 2046篇 |
丛书文集 | 116篇 |
教育普及 | 1篇 |
理论方法论 | 2134篇 |
综合类 | 398篇 |
社会学 | 10903篇 |
统计学 | 4318篇 |
出版年
2021年 | 123篇 |
2020年 | 339篇 |
2019年 | 507篇 |
2018年 | 524篇 |
2017年 | 768篇 |
2016年 | 547篇 |
2015年 | 412篇 |
2014年 | 538篇 |
2013年 | 3822篇 |
2012年 | 706篇 |
2011年 | 656篇 |
2010年 | 550篇 |
2009年 | 502篇 |
2008年 | 584篇 |
2007年 | 602篇 |
2006年 | 552篇 |
2005年 | 503篇 |
2004年 | 458篇 |
2003年 | 366篇 |
2002年 | 431篇 |
2001年 | 553篇 |
2000年 | 483篇 |
1999年 | 461篇 |
1998年 | 381篇 |
1997年 | 350篇 |
1996年 | 353篇 |
1995年 | 307篇 |
1994年 | 280篇 |
1993年 | 343篇 |
1992年 | 353篇 |
1991年 | 347篇 |
1990年 | 338篇 |
1989年 | 315篇 |
1988年 | 286篇 |
1987年 | 308篇 |
1986年 | 260篇 |
1985年 | 292篇 |
1984年 | 316篇 |
1983年 | 290篇 |
1982年 | 251篇 |
1981年 | 184篇 |
1980年 | 218篇 |
1979年 | 251篇 |
1978年 | 202篇 |
1977年 | 183篇 |
1976年 | 183篇 |
1975年 | 205篇 |
1974年 | 188篇 |
1973年 | 145篇 |
1972年 | 129篇 |
排序方式: 共有10000条查询结果,搜索用时 547 毫秒
11.
12.
In this article, we attempt to extend and nuance the debate on intellectual property (IP) strategy, appropriation, and open innovation in dynamic and systemic innovation contexts. We present the case of four generations of mobile telecommunications systems (covering the period 1980–2015), and describe and analyze the co-evolution of strategic IP management and innovation ecosystems. Throughout this development, technologies and technological relationships were governed with different and shifting degrees of formality. Simultaneously, firms differentiated technology accessibility across actors and technologies to benefit from openness and appropriation of innovation. Our analysis shows that the discussion of competitiveness and appropriability needs to be expanded from the focal appropriability regime and complementary assets to the larger context of the innovation ecosystem and its cooperative and competitive actor relations, with dispersed complementary and substitute assets and technologies. Consequently, the shaping of complementary and substitute appropriability regimes is central when strategizing in dynamic and systemic innovation contexts. This holds important implications for the management of open innovation, innovation ecosystems, platforms, and coopetition. 相似文献
13.
Arnfinn H. Midtbøen 《The British journal of sociology》2015,66(1):193-214
Although field experiments have documented the contemporary relevance of discrimination in employment, theories developed to explain the dynamics of differential treatment cannot account for differences across organizational and institutional contexts. In this article, I address this shortcoming by presenting the main empirical findings from a multi‐method research project, in which a field experiment of ethnic discrimination in the Norwegian labour market was complemented with forty‐two in‐depth interviews with employers who were observed in the first stage of the study. While the experimental data support earlier findings in documenting that ethnic discrimination indeed takes place, the qualitative material suggests that theorizing in the field experiment literature have been too concerned with individual and intra‐psychic explanations. Discriminatory outcomes in employment processes seems to be more dependent on contextual factors such as the number of applications received, whether requirements are specified, and the degree to which recruitment procedures are formalized. I argue that different contexts of employment provide different opportunity structures for discrimination, a finding with important theoretical and methodological implications. 相似文献
14.
15.
16.
Aldaba Fernando T. 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2002,13(2):179-192
This paper discusses an emerging role for Philippine NGOs—building and maintaining intersectoral cooperation among various sectors of society to tackle key issues like agricultural development, HIV/AIDS, and agrarian reform. The three case studies elaborated in the paper show that Philippine NGOs play important intermediary and bridging functions crucial for the success of multistakeholder partnerships. NGOs are well equipped for this because of their middle-class and professional nature and because of various characteristics like autonomy, flexibility, and the ability to mobilize resources. 相似文献
17.
Susan D. Calkins Susan E. Dedmon Kathryn L. Gill Laura E. Lomax Laura M. Johnson 《Infancy》2002,3(2):175-197
A study sample of 162 six‐month‐old children was selected from a larger sample of 346 infants on the basis of parents' report of their infants' temperament and a laboratory assessment of temperament. Infants were classified as easily frustrated and less easily frustrated and compared on a number of emotion regulation, physiology, and temperament measures. Results indicated that male and female infants were equally likely to be classified as frustrated and less easily frustrated; however, male infants were less able to regulate physiologically. Easily frustrated infants used different emotion regulation strategies and were observed to be less attentive and more active than less easily frustrated infants when observed in the laboratory. These infants were also characterized by their parents as more active, less attentive, and more distressed to novelty. Infants classified as easily frustrated were more reactive physiologically and less able to regulate physiological reactivity than their less easily frustrated counterparts. It is hypothesized that this cluster of characteristics may constitute a unique temperamental type that may have implications for other types of behavioral functioning. Limitations of the study are that observations are based on a single brief assessment of the infant, modest effect sizes were found, and the study is cross‐sectional. 相似文献
18.
T. S. Ferguson 《Statistical Papers》1995,36(1):31-40
A class of symmetric bivariate uniform distributions is proposed for use in statistical modeling. The distributions may be
constructed to be absolutely continuous with correlations as close to±1 as desired. Expressions for the correlations, regressions
and copulas are found. An extension to three dimensions is proposed. 相似文献
19.
H. Küchenhoff 《Statistical Papers》1995,36(1):41-47
The simple logistic regression model with normal measurement error and normal regressor is shown to be identifiable without any extra information about the measurement error. The multiple logistic regression model with more than one regressor variable measured with error is not identifiable. If the covariance matrix of the measurement error is known up to a scalar factor, the model is identified. Further we discuss why in spite of the identifiability the models cannot be estimated in a reasonable way without extra information about the measurement error. 相似文献
20.